Driving roll for revolving clearers



Aug. 21, 1928. 1,681,875

L. W..PENNEY DRIVING ROLL FOR RE VOLVING CLEARERS Filed April 26, 1926 Patented Aug. 21, 1928 UNITED, STATES PATENT OFFICE.

LOREN W. PENNEY, OF NEWTON, MASSACHUSETTS, ASSIGNOR TO SACO-LOWELL SHOPS 015 BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

DRIVING ROLL FOR REVOLYIN G CLEARERS.

Application filed April 26. 1926. Serial No. 104,532.

It is now a common practice to equip drawing frames of the character used in the textile industry with a revolving clearer for the drawing rolls. Such a clearer usually consists of an endless belt made of felt or other fabric and is supported on two rolls, one of which is driven slowly so as to feed the clearer cloth slowly across the faces of the drawing rolls. The present invention relates to the roll (often referred to as the star roll) which drives the clearer cloth. This driving roll has projections or teeth which embed themselves in the clearer cloth to feed the cloth as the roll is revolved. Several methods have been used heretofore of making the teeth on these rolls. In some cases the rolls have been drilled and pins inserted to form the teeth. In other cases they have been made by fluting the roll and then turning away the stock for short spaces, thus leaving square raised points. A very common practice, also, has been to prick the roll lengthwise thereof and thus to drive up sharp teeth arranged in circumferential rows, the teeth in each row being directly behind each other. These methods are expensive, they involve a considerable amount of hand labor, and some of them, particularly the method last mentioned, produces a roll which wears the clearer cloth rapidly. The clearer cloths usually are made of an all wool felt, are very expensive, and consequently, the replacement of these cloths is an important item in the upkeep of a drawing frame.

The present invention aims to devise a roll of the character described which can be manufactured more economically than the prior constructions, and which will feed the clearer cloth properly without tearing it or wearing the cloth excessively.

The nature of the invention will be readily understood from the following description when read in connection with the accompanying drawings, and the novel features will be particularly pointed out in the appended claims.

In the drawings,

Figure l is a vertical, cross-sectional view of a drawing frame showing a typical relationship between the drawing rolls and the clearer cloth;

Fig. 2 is a side elevation of a clearer cloth driving roll embodying this invention;

Fig. 3 is a transverse, cross-sectional view through the roll shown in Fig. 2 and showing the roll driving a clearer cloth; and

Fig. 4 1s a perspective cross-sectional view of a small section of the roll shown in Fig. 2.

1n the machine shown the upper and lower drawing rolls are indicated at 2 and 3, respectively, and the clearer cloth is shown at 4. This clearer cloth is supported on an idle roll 5 and a driving roll 6, both of these rolls being supported by parts nngunted on the lower side of the cover 7.

The roll 6 provided by this invention is best shown in Figs. 2, 3 and 4. From an inspection of these views it will be seen that the portion of the roll which engages and drives the clearer cloth 4 is provided with a series of teeth 8 which are integral with the roll and project from the periphery thereof. Unlike prior constructions, the teeth of this roll all point laterally or circumferentially of the roll and in the same circumferential direction. Each tooth preferably is formed by driving the metal of the roll backwardly in a direction tangential to a circle lying within and concentric with the roll. This produces a groove 9 immediately in front of each tooth and forces some of the metal upwardly above the periphery of the roll, thus forming a blunt tooth having an abrupt front face, as clearly shown in the drawings. The tool used in performing this operation preferably is of such a shape that the front face of each tooth will be substantially flat and the top of the tooth will be rounded longitudinally of the roll. The rear surface of the tooth will also be rounded, and the tooth is tapered or gradually recedes in height circumferentially of the roll.

A. roll of the construction shown can readily be made in a screw cutting lathe equipped with an attachment of the kind commonly used for backing off cutters. It is preferabe to arrange the teeth spirally so that no two teeth will have the same path of revolution. In making the particular roll shown in Figs. 2, 3 and 4, the lathe is geared for a quarter inch pitch and the tooth forming tool is forced inwardly three and one-half times during each revolution of the roll so that fourteen teeth are formed in each inch of length of the roll, and no two teeth revolve in the same path. A great variety of spacings may be used, and the roll may be made by other methods, the method above described being that which I prefer, since it permits the manufacture of the roll by automatic machinery and eliminates much of the labor heretofore required.

A roll of the construction shown has the advantage of being farrmoreeconomical to manufacture than prior constructions of which I am aware. The teeth being distributed uniformly along the cloth engaging surface of the roll exert a minimum of wear on the clearer cloth, and since no two teeth have the same path of revolution, the wear is distributed uniformly. The fact that the teeth are relatively blunt prevents them from tearing the clearer cloth. This roll also has no tendency to pull the cloth sideways or toward either end of the roll which is an objectionable characteristic of some prior constructions.

While I have above shown a convenient embodiment of the invention, it will be understood that the roll may be supported and driven in any desired manner, and that considerable variation in the construction of the roll itself may be made without departing from the spirit or scope of the invention.

Having thus described my invention, what I desire to claim as new is:

1. A driving roll for clearer cloths having a series of blunt teeth integral therewith and tially from the periphery thereof, said teeth being spaced from each other both longitudinally and circumferentially of the roll all of said teeth pointing circumferenof the roll and in the same direction. 2. A driving roll for clearer cloths having a series of teeth integral therewith and projecting from the periphery thereof, said teeth being spaced from each other both longitudinally and circumferentially of the roll each tooth having a blunt rounded surface rising from the peripheral surface of the roll. I

' 3. A driving roll for clearer cloths having teeth integral therewith and projecting from the periphery thereof, said teeth being arranged in a spiral series and all pointing pro ectln teeters circumferentially of the roll and in the same direction.

4. A driving roll for clearer cloths having a series of blunt teeth integral therewith and projecting from the periphery thereof, said teeth being spaced from each other both longitudinally and circumferentially of the roll each tooth being rounded longitudinally of the roll and tapered circumferentially thereof but having an abrupt face directed toward one side of the roll.

5. A driving roll for clearer cloths having a series of blunt teeth integral therewith and projecting from the periphery thereof, said teeth being spaced from each other both longitudinally-and circumferentially of the roll each tooth having a substantially flat front face and a rounded rear surface.

6. A driving roll for clearer cloths having a series of blunt teeth integral therewith and projecting from the periphery thereof, said teeth being spaced from each other both longitudinally and circumferentially of the roll each tooth being formed by forcing a small area of the metal of the roll backward infit direction tangent of a circle within the re 7. A driving roll for clearer cloths having a series of blunt teeth integral therewith and projecting from the periphery thereof, each tooth having an abrupt laterally directed face lying partly above and partly below the peripheral surface the roll and formed by indenting the metal of the roll taililgentially to a circle lying inside the ro 8. A driving roll for clearer cloths having a series of blunt teeth integral therewith and projecting from the periphery thereof,

each toothhaving an abrupt laterally dij ecting above the periphery of the roll being rounded longitudinally of the roll and gradually decreasing in height circumferentially of the-roll.

' LOREN IV. PENNEY. 

